Arginine (also called L arginine) is a semi-essential amino acid involved in numerous areas of human biochemistry. It is also well known as a precursor to nitric oxide (NO), a key component of endothelial-derived relaxing factor, a messenger molecule involved in a variety of endothelium-dependent physiological effects. We carry several products that contain Arginine and L-Arginine as well as Arginine itself. If you are looking to supplement your diet add Arginine so that you can achieve your dietary goals!